Employee Benefit Plans - MEC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Acquisition	$ 81
Settlement		$ (5)
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Acquisition		0	$ 37
Service cost		12	7	$ 8
Interest cost		19	21	27
Expected return on plan assets		(22)	(34)	(40)
Settlement		0	0	0
Net amortization		(3)	(4)	(6)
Net periodic benefit cost (credit)		6	(10)	(11)
Other Postretirement | MEC
Defined Benefit Plan Disclosure [Line Items]
Acquisition	$ 37	(5)	37
Service cost		9	4	5
Interest cost		8	7	10
Expected return on plan assets		(10)	(14)	(13)
Settlement		0	0	0
Net amortization		(4)	(5)	(3)
Net periodic benefit cost (credit)		3	(8)	(1)
Other Postretirement | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)		1	(5)	1
United States | Pension
Defined Benefit Plan Disclosure [Line Items]
Acquisition		0	81
Service cost		30	17	16
Interest cost		78	93	111
Expected return on plan assets		(134)	(140)	(154)
Settlement		3	0	0
Net amortization		25	32	31
Net periodic benefit cost (credit)		2	2	4
United States | Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Acquisition		(1)	81
Service cost		20	8	6
Interest cost		22	25	30
Expected return on plan assets		(37)	(40)	(41)
Settlement		(5)	0	0
Net amortization		1	1	1
Net periodic benefit cost (credit)		1	(6)	(4)
United States | Pension | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)		$ (20)	$ (13)	$ (8)